package scanner

import (
	"fmt"
	"io/ioutil"
	"net/http"
	"regexp"
	"strings"
)

// Public definition of a Scanner
type Scanner struct {
	Client *http.Client
}

// Internal interface for Scanner
type scanner interface {
	Scan(url string, regExp regexp.Regexp) (bool, error)
}

// Given a URL and regular expression return if it matches along with any error
// NOTE: In case of an error this will return false
func (s *Scanner) Scan(url string, regExpString string) (bool, error) {
	regExp, err := regexp.Compile(regExpString)
	if err != nil {
		return false, err
	}

	resp, err := s.Client.Get(url)

	if err != nil {
		if strings.Contains(err.Error(), "device or resource busy") {
			fmt.Println("If you see this stop execution and recompile with netgo")
			return false, nil
		}
		if strings.Contains(err.Error(), "too many open files") {
			fmt.Println("If you see this stop execution then increase 'ulimit -n'")
			return false, nil
		}
		return false, err
	}
	defer resp.Body.Close() // Ensure body is closed at the end of the function

	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return false, err
	}

	return regExp.Match(body), nil
}